Nine buildings across the East Midlands have won a regional architecture prize.

Contenders for The Royal Institute of British Architects (RIBA) East Midlands annual awards include a castle, a former glass warehouse and a school sports pavilion.

The winning buildings, which were revealed at a ceremony in Nottingham, will now be considered for the national award, which will be announced in June.

The Portland Collection, Welbeck Estate, in Worksop, Nottinghamshire, also won awards for Building of the Year Award, Sustainability Award and Conservation Award.

Lucy Plumridge, regional jury chair, said: "The quality and attention to detail exhibited by the winning schemes was outstanding.

"Every scheme suited its end users perfectly, creating a sense of place and an aspirational environment."

RIBA Awards have been running for 50 years.

The Portland Collection, Welbeck Estate, Worksop

Image copyrightNick Hufton/RIBA

The building's protruding barrel-vaulted zinc roofs have been created to mimic Welbeck Abbey. The collection's entrance allows visitors to look out onto a line of trees and a 19th century lodge.

Contour House, Derbyshire

Image copyrightPeter Landers/RIBA

This house was designed in a curve to reflect the contours and meadows of the Peak District. The stone and natural timber material used were chosen to reflect a dry stone wall or a stone barn typical of the area.

Derby Arena

Image copyrightMartine Hamilton Knight/RIBA

Derby Arena includes a 250m indoor cycle track, 1,500-capacity grandstand and a sports infield. The venue has been described as "world class" by four-time Olympic gold medallist and Tour de France winner Sir Bradley Wiggins.

Garden Buildings, Warmington

Image copyrightJustin Paget/RIBA

A garage, garden store and the remains of an old piggery have been demolished to make way for a new building that includes a kitchen and bathroom. Located between the main house and garden, the owners hope to use it as a weekend retreat.

Heart of Campus, Nottingham Trent University

Image copyrightMartine Hamilton Knight/RIBA

Two buildings have combined to create a new entrance for the university's Clifton campus. They have replaced worn out 1960s' teaching blocks and incorporate classroom and lecture spaces.

Leicester Print Workshop

Image copyrightAnton Gorlenko/RIBA

This former 1970s glass warehouse has been turned into printmaking studios, a library, gallery and educational space. The restoration of the building, in the city's Cultural Quarter, was part funded by Arts Council England.

Lincoln Castle Revealed

Image copyrightAndrew Arrol/RIBA

Visitors to Lincoln Castle can now complete a full circuit of the walls as part of the introduction of a series of stairwells, a new railing system and bridges. The project also created a new vault for their copy of Magna Carta and Charter of the Forest. It is, as such, the only place where both documents can be seen together.

Nottingham One

Image copyrightMartine Hamilton Knight/RIBA

The focal point of this £40m development in Nottingham is a 160m facade which has filled a hole in the city's streetscape. Balconies, pavilions and terraces on the south side of the building create viewing points for the canal below.

Private house, Northamptonshire

Image copyrightAlex Franklin/RIBA

This house was created on the site of a smaller, existing dwelling. It stands alone, remote from the nearest village, on a ridge of higher ground overlooking the rolling landscape of a nearby farm.